Saving Our Night Sky: Mitigating the Growing Threat of Satellite Megaconstellations

The starry night sky with a view of our Milky Way.

Have you ever gazed at the night sky and marveled at the Milky Way stretching across the darkness? For most of the world today, that simple pleasure is disappearing. Over 80% of people can’t see a clear night sky, and one-third can’t spot the Milky Way due to light pollution. The culprit works beyond city lights: satellites and other space instruments streak across the skies, reflecting sunlight back to Earth. Without stronger policies to address satellite light pollution and increasing funding for sustainable satellite development, these losses could be permanent. Are we willing to lose our night sky? 

Satellites are among the fastest-growing contributors to light pollution, particularly satellite megaconstellations, which are formations of individual satellites that work collaboratively in a system. As of 2024, over 6,000 satellites reside in low Earth orbit (LEO), with large tech companies like SpaceX, Amazon’s Project Kuiper, and Eutelsat’s OneWeb planning to add 100,000 more ready to loom over Earth in the coming decade. Each addition creates hazy night skies, destroying research results, altering ecosystems, and even endangering human health.

The wrath of these satellites extends far beyond finding exoplanets or tracking galaxies. Light pollution disrupts circadian rhythms in humans, animals, and even plants. Nobel Prize-winning research in physiology highlights how biological rhythms synchronize with the Earth’s natural cycles of light and darkness. Disrupting these light-based patterns can cause sleep disorders, behavioral changes in wildlife, and even increased cancer risk in humans. These shifts can have irreversible impacts on Earth’s environment as well, exacerbating climate change-related damage by altering the natural patterns of life on Earth. The brightening of our night skies isn’t simply an inconvenience; it threatens life as we know it. 

Additionally, Earth-based scientific research faces tremendous risks. Astronomical observations, both professional and amateur, are already notably suffering. Radio frequencies from thousands of satellites interfere with sensitive telescopes, which hinders groundbreaking discoveries by blocking faint signals. Reflected sunlight from satellites creates streaks across images, blinding beautiful discoveries. The Vera C. Rubin telescope alone will suffer from satellite streaks in 30% of its nightly observations. Every streak and interference reduces the data’s clarity and limits our ability to discover new planets, galaxies, and phenomena. Imagine spending days curating a potentially field-altering image, only to find the presence of corrupting satellite streaks. Neglecting our night sky could forever stall both human curiosity and scientific progress. 

Current policies have also proven nearly useless. The United Nations Committee on the Peaceful Uses of Outer Space (UNOOSA) and the International Astronomical Union (IAU) have issued countless recommendations, even encouraging reduced satellite brightness, with little success. The current guidelines are both voluntary and greatly outdated compared to the rapid expansion of LEO satellites – a deadly combination. Without enforceable measures, companies and agencies are free to throw countless bright satellites into orbit, ignoring the brutal environmental implications. 

Still, it isn’t too late to act. Fostering collaboration between the government and private sector to fund the development of sustainable satellite technologies that reduce reflectivity and minimize light pollution could help reduce environmental risks. Establishing clear, federal guidelines on light reflection amounts from satellite megaconstellations will also help reduce overall pollution levels and encourage the development of sustainable solutions.

The Government Accountability Office (GAO) further emphasizes this idea, suggesting that developing similar standards could encourage the implementation of mitigation measures, leading to sustainable standard practices.  

Public awareness campaigns can also emphasize the urgency of the crisis and further encourage sustainable satellite launches. Mobilizing greater constituent support through grassroots advocacy and collaborating with scientists or dark sky advocacy groups, such as the International Dark-Sky Association, for credibility can improve credibility. Educating the public through social media can further encourage action. Recently, the Smithsonian’s National Museum of Natural History curated a temporary exhibit titled “Lights Out,” broadening both local and tourist perspectives regarding the impacts of light pollution on our night sky. Continuing similar practices and expanding current projects to emphasize the threat of satellite megaconstellations could prove highly effective in informing communities. With such measures, we can preserve dark skies and ensure that scientific discovery prevails for generations to come. 

The choice is clear: either we allow the night sky to vanish beneath a haze of reflected sunlight, or we act decisively to protect it. With stronger policies, sustainable satellite development, and coordinated efforts between the government and industry, we can enjoy the Milky Way, protect ecosystems, and preserve the ability to explore the universe. If LEO technologies are truly the path to innovation, these instruments must be sustainably developed and maintained to ensure we actually benefit from the advancement, rather than lose the opportunity for discovery. The difference between marveling at a star-filled sky and watching it disappear forever relies on the steps we take now.

Image Credit

ForestWander, CC 3.0, via Wikimedia Commons